Re: [ugly patch] Save .15W-.5W by AHCI powersaving

[Mark Lord]

Pavel Machek wrote:
> Hi!
>
> This is a patch (very ugly, assumes you have just one disk) to bring
> powersaving to AHCI. You need Alan's SCSI autosuspend (attached) patch
> as a base.
>
> It saves .5W compared to config with disk spinning, and even .15W
> compared to hdparm -y... on my thinkpad x60 anyway.
..

There was a discussion of this here today.
It makes good use of AHCI-specific features.

Has it been tested with a Port-Multiplier yet?

This is cool enough that we really ought to do a hardware-independent
version, so that all SATA interfaces could benefit.  Especially ata_piix,
but others too.

Cheers
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